The interhalogen compound formed from the reaction of bromine with an excess of fluorine is:

Which of the following substances is the most volatile?

Which of the following elements has a half-life in milliseconds?

Which element from the following combines with hydrogen to form a compound having the lowest acidic strength?

Which of the following statements regarding the properties of halogens are correct?
$(a)$ Due to small size and strong inter-electronic repulsion,the electron gain enthalpy of fluorine is less negative than that of chlorine.
$(b)$ Iodine has a different physical state and colour compared to other members of the group.
$(c)$ Fluorine does not show a positive oxidation state.
$(d)$ In $X_{2(g)} + H_2O(l) \rightarrow HX(aq) + HOX(aq)$ (where $X = Cl$ or $Br$).

Chlorine is allowed to react with an excess of ammonia. In this reaction,$1$ mole of chlorine can oxidize '$Z$' moles of $NH_3$. The value of '$Z$' is: